c# generate 2d barcode Figure 6-19. The results of comparing one insert vs. a loop with multiple inserts in Font

Encode PDF417 in Font Figure 6-19. The results of comparing one insert vs. a loop with multiple inserts

Figure 6-19. The results of comparing one insert vs. a loop with multiple inserts
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CHAPTER 6 MANIPULATING DATA
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Database Cleanup
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Run the script in Listing 6-20 to clean up the tables used in this chapter. You can download the script from this book s page at http://www.apress.com. Alternately, you can reinstall the sample databases by following the instructions in the Installing the Sample Databases section in 1. Listing 6-20. Deleting Demo Tables USE [AdventureWorksLT2008]; GO EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[demoProduct]') AND type in (N'U')) DROP TABLE [dbo].[demoProduct]; GO IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[demoCustomer]') AND type in (N'U')) DROP TABLE [dbo].[demoCustomer]; GO EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[demoAddress]') AND type in (N'U')) DROP TABLE [dbo].[demoAddress]; GO EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[demoSalesOrderHeader]') AND type in (N'U')) DROP TABLE [dbo].[demoSalesOrderHeader]; GO IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[demoSalesOrderDetail]') AND type in (N'U')) DROP TABLE [dbo].[demoSalesOrderDetail]; GO IF IF IF
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CHAPTER 6 MANIPULATING DATA
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EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[demoTransaction]') AND type in (N'U')) DROP TABLE [dbo].[demoTransaction]; GO EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[demoCustomerSummary]') AND type in (N'U')) DROP TABLE [dbo].[demoCustomerSummary]; GO IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[demoDefault]') AND type in (N'U')) DROP TABLE [dbo].[demoDefault]; GO EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[demoAutoPopulate]') AND type in (N'U')) DROP TABLE [dbo].[demoAutoPopulate]; IF IF
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USE AdventureWorks2008; GO EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[demoPerformance]') AND type in (N'U')) DROP TABLE [dbo].[demoPerformance]; IF
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Summary
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How to write data modification statements is not difficult to learn once you ve mastered the basics of selecting data. These tasks do, however, require much more care because it is possible to unintentionally modify and delete rows or even empty entire tables. Always check the WHERE clause with a SELECT statement first when writing ad hoc statements. Whenever possible, do modifications on sets of data, not one row at a time. You will often see amazing differences in performance. Many developers learn to operate on one row at a time, but this is not the best way for SQL Server to work.
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CHAPTER 7
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Understanding T-SQL Programming Logic
Even though the primary purpose of T-SQL is to retrieve and manipulate data, like other programming languages, it also contains logic elements. Most of the time you will write T-SQL statements that retrieve or update data, but you can also set up loops and write code with conditional flow. Often database administrators write scripts in T-SQL to perform maintenance tasks that require more than just retrieving or updating data. For example, you might need to write a script that checks the last backup date of all databases on the server or write a script that checks the free space of all the databases. Although most administrative tasks are beyond the scope of this book, you may find many uses in your environment for the techniques you learn in this chapter.
Variables
If you have programmed in any other language, you have probably used variables in your programs. Variables hold temporary values in memory. For example, you might use a variable to hold the results of a calculation, or the results of a string concatenation, or to control the number of times a loop executes.
Declaring and Initializing a Variable
To use a variable, you must first declare it. Beginning with SQL Server 2008, you can initialize, that is, assign a value, to the variable at the same time that you declare it. Earlier versions of SQL Server required that you assign a value on a separate line. Here is the syntax for declaring a variable and assigning a value both at the same and later in the code: DECLARE @variableName <type>[(size)] = <value1> SET @variableName = <value2> SELECT @variableName = <value3> SELECT @variableName = <col1> FROM <table1>
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